So far, few images of the damage have popped up, as the storm takes its final breaths on Florida.
Latest numbers from the WHO suggested that almost six million people in the U.S. are without power, while nearly 200,000 people are staying at more than 600 shelters in Florida and Georgia.
"This will be the largest ever mobilization of (electric) line restoration workers in this country, period, end of story", Trump's homeland security adviser, Tom Bossert, told reporters Monday.
House after house, block after block, roofs are torn off, boats are on the road, and RVs are mangled in trees.
Looping hurricanes have happened before, including Hurricane Jeanne, which in 2004 appeared to be heading out to the open Atlantic only to turn around and strike the Florida coast.
"This was a big part of my life. It's bad now, it's going to continue to get worse", meteorologist Angie Enyedi said.
If the water hadn't pushed out, Shiveley said, storm surge could have been in the eight or nine-foot range.
The National Weather Service's Bill South stayed behind in Key West to work with first responders.
Those who did evacuate are trying to get in.
An aircraft carrier and other Navy ships were being dispatched to the Florida Keys, where the full force of Irma hit, especially along the Middle and Upper Keys. Rather, it was a potential saving grace for the city of Tampa.
As anxious residents lost patience, tensions climbed. Although hurricane season begins on June 1 and lasts until November 30, late August and September are considered the peak months of the season. "Next time I'm staying in Key Largo" one of them yelled.
Before making landfall in Florida, Hurricane Irma broke records on its relentless churn through the Caribbean.
If you live in Florida, Georgia, or South Carolina, consider opening your home to evacuees through Airbnb.
It also warned residents to be wary of snakes and alligators that may be driven into the floodwaters. In addition, severe damages to infrastructure and health centres, loss of electricity and limited access to clean water are reported.